<template>
	<div class="list" ref="wrapper">
   <div>
    <div class="area">
       <div class="title border-topbottom">当前城市</div>
       <div class="button-list">
         <div class="button-wrapper">
           <div class="button">{{this.currentCity }}</div>
         </div>
       </div>
     </div>
     <div class="area">
       <div class="title border-topbottom">热门城市</div>
       <div class="button-list">
         <div class="button-wrapper" 
              v-for="item of hotCities" 
              :key="item.id"
              >
           <div class="button"
                @click = "handleCurrentCity(item.name)">{{item.name}}</div>
         </div> 
       </div>
     </div> 
     <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
       <div class="title border-topbottom">{{key}}</div>
       <div class="item-list">
         <div class="item border-bottom" 
              v-for="subitem of item"
              @click = "handleCurrentCity(subitem.name)">{{subitem.name}}</div>
       </div>
     </div>
    </div>  
  </div>
</template>
<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default{
	name: 'CityList',
  props : {
    cities: Object,
    hotCities: Array,
    letter : String
  },
  computed: {
    ...mapState({
      currentCity : 'city'
    })
  },
  methods: {
    handleCurrentCity(city){
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  }
  ,
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>
<style lang="stylus" scoped>
@import '~styles/varibles.styl'

.border-topbottom
  &:before
    border-color: #ccc
  &:after
    border-color: #ccc
.border-bottom
  &:before
    border-color: #ccc
.list
  overflow: hidden
  position: absolute
  top: 1.58rem
  left: 0
  right: 0
  bottom: 0      
  .title
    line-height: .54rem
    background: #eee
    font-size: .26rem
    padding-left: .2rem
    color: #666
  .button-list
     overflow:hidden
     padding: .1rem .6rem .1rem .1rem
     .button-wrapper
        float: left
        width: 33.33%
        .button  
           margin: .1rem
           padding: .1rem 0
           text-align: center
           border: .02rem solid #ccc
           border-radius: .06rem
  .item-list
    .item
      line-height: .76rem
      padding-left: .2rem
</style>